* Bumping pyOpenSSL==0.15.1 as 0.13.1 doesn't compile on OSX10.10.
* Swapping .create_auto_spec tests to MagicMock to avoid:
    AttributeError: Mock object has no attribute '__name__'
* Initial BASIC auth implementation + unit tests

Checkpoint before integration tests.

This extension affords create/read/update without cluttering the basic
etcd.Client implementation.

The model is reworked for a cleaner API: user's roles can be assigned via
list/tuple, permissions are moddeled like a dictionary.

Adding coverage goal to buildout to verify testing progress.

Background at: https://coreos.com/etcd/docs/0.4.7/etcd-api/#read-consistency

The transient "Lock not found" errors are caused by the client not being able
to read it's own write. By requiring a quorum on read, we ensure
consistency.

Use quorum reads for locks